Abstract
Cu-Pd samples of compositions varying from 16 to 26 at.% Pd were irradiated in situ in the 1.5 MeV electron microscope at various temperatures. Low-temperature (−180°C) irradiation produced completely disordered solid solutions, room-temperature irradiation produced steady-state short-range order (SRO), and high-temperature irradiation tended to produce the expected equilibrium long-range order. In particular, the 18 and 20% samples irradiated at room temperature exhibited steady-state modulated SRO although only the simple Ll 2 ordered structure was expected at equilibrium. It is suggested that spinodal ordering is responsible for these effects. An f.c.c.-based Cu-Pd phase diagram is proposed incorporating ordering stability loci and a metastable Lifshitz point.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
